Richard Totty - Academia.edu (original) (raw)
Papers by Richard Totty
Journal of the Forensic Science Society, 1985
Journal of the Forensic Science Society, 1983
The journal of Detective Walpole records his scientific examination of a variety of cases during ... more The journal of Detective Walpole records his scientific examination of a variety of cases during the years 1935 and 1936, providing a unique insight into the workings of a pioneering forensic science laboratory.
Journal of the Forensic Science Society, 1985
The direction of pen movement within selected characters in the handwriting of a large sample of ... more The direction of pen movement within selected characters in the handwriting of a large sample of writers has been determined. The results show significant differences between leftand right-handed writers and allow an estimate to be made of the confidence with which a document examiner can attribute handwriting to a particular writing hand.
Journal of the Chemical Society D: Chemical Communications, 1971
Empirical rules for rationalization of the signs At a wavelength characteristic of the lowest ene... more Empirical rules for rationalization of the signs At a wavelength characteristic of the lowest energy isotropic transition ketones exhibited a single positive or negative m.c.d. band or an S-shaped curve with the positive component at longer wavelength,t and, whilst the effect of the molecular environment was discussed, no comprehensive rationale was proposed.' of m.c.d. bands of carbonyl compounds are presented. THE magnetic circular dichroism spectra of a number of aliphatic ketones have recently been shown to be sensitive to the structural environment around the carbonyl gr0up.l t With the exception of 1,1,l-trichloropropan-2-one.
Journal of the Forensic Science Society, 1977
The examination of colour is of particular importance in the investigatation of documents. Colour... more The examination of colour is of particular importance in the investigatation of documents. Coloured fillers may be used to decipher obliterated or altered writing and printing and apparently similar inks may be distinguished by photographic techniques or by thin layer chromatography of the constituent dyes. Sometimes the presence of even minute traces of colour can be significant.
Forensic Science International, 1983
... 82 CANON NPN11 1 6 1 i 10 iw XEROX 660 60 y I ~ 40 zaa / ~, TOSHIBAFAX BD711 ~I 60 40 1000 35... more ... 82 CANON NPN11 1 6 1 i 10 iw XEROX 660 60 y I ~ 40 zaa / ~, TOSHIBAFAX BD711 ~I 60 40 1000 3500 3000 25M 2000 me 1600 I6 B0 1200 1000 DOB 600 100 200 WAVENUMBER (CM ... This may be a result of poor sample, a faint copy or be a characteristic of the toner itself. ...
Forensic Science International, 1990
This paper discusses, with reference to specific case investigations, the various techniques avai... more This paper discusses, with reference to specific case investigations, the various techniques available for the solution of these problems. These include some very simple techniques which are in everyday use by forensic scientists, for example trained and informed visual and low power microscopic examination of the documents. They also include the application of techniques which are frequently used in forensic science laboratories, for example energy dispersive spectrometry (using a scanning electron microscope) and infra red spectroscopy, but which are rarely applied to document examination. Also involved are techniques which are well developed within particular fields — for example the detailed analysis of paper fibres — but which are rarely, if at all, used in forensic science.
Forensic Science International, 1985
Abstract Ink lines made by porous tip and roller ball pens have been examined by high performance... more Abstract Ink lines made by porous tip and roller ball pens have been examined by high performance thin layer chromatography (HPTLC) and by transmission microspectrophotometry (VM) in the visible region. Better discrimination between apparently similar coloured inks was obtained with HPTLC but VM has value as an additional technique for ink examination.
Forensic Science International, 1979
ABSTRACT
Journal of the Forensic Science Society, 1985
Information Technology & The Law, 1986
Chemischer Informationsdienst
Journal of the Forensic Science Society
An evaluation was made of the SIGNCHECK signature verifier. The equipment digitizes signatures on... more An evaluation was made of the SIGNCHECK signature verifier. The equipment digitizes signatures on cheques and compares them with a reference set of parameter values encoded on the cheque. Its performance in its intended role, as a screening device for unseen forgeries at the time of presentation of a cheque, was adequate, but it has numerous limitations as a laboratory aid to the investigation of questioned signatures. It is a step towards mechanization of this task, and some deficiencies may be remedied by improvements to the device, such as increasing the resolution of the scanning.
Journal of the Chemical Society D Chemical Communications, 1969
Journal of the Chemical Society D Chemical Communications, 1971
Can J Chem, 1971
In the presence of chiral environment compounds, C, optical rotation is induced in symmetric subs... more In the presence of chiral environment compounds, C, optical rotation is induced in symmetric substrates, S, and may be detected as circular dichroism in the electronic spectra of the solutions. Thus the n − π* transitions of symmetric and racemic carbonyl compounds, and of symmetric nitro and azo compounds, become optically active when these S are dissolved in chiral hydrocarbons, ketones, or carbinols, or in solutions of these C in achiral solvents. The rotational strengths of the induced circular dichroism bands of S are solvent, temperature, and concentration dependent. Only limited correlation of the sign and magnitude of the induced bands with the stereochemistry of C and S is evident on the data so far accumulated. Halogenated achiral solvents enhance the intensity, and, in some cases reverse the sign of the induced bands.A new mechanism of asymmetric induction is proposed in which specific bonding of C with S is not prerequisite.
Information Technology & The Law, 1990
Journal of the Forensic Science Society, 1985
Journal of the Forensic Science Society, 1983
The journal of Detective Walpole records his scientific examination of a variety of cases during ... more The journal of Detective Walpole records his scientific examination of a variety of cases during the years 1935 and 1936, providing a unique insight into the workings of a pioneering forensic science laboratory.
Journal of the Forensic Science Society, 1985
The direction of pen movement within selected characters in the handwriting of a large sample of ... more The direction of pen movement within selected characters in the handwriting of a large sample of writers has been determined. The results show significant differences between leftand right-handed writers and allow an estimate to be made of the confidence with which a document examiner can attribute handwriting to a particular writing hand.
Journal of the Chemical Society D: Chemical Communications, 1971
Empirical rules for rationalization of the signs At a wavelength characteristic of the lowest ene... more Empirical rules for rationalization of the signs At a wavelength characteristic of the lowest energy isotropic transition ketones exhibited a single positive or negative m.c.d. band or an S-shaped curve with the positive component at longer wavelength,t and, whilst the effect of the molecular environment was discussed, no comprehensive rationale was proposed.' of m.c.d. bands of carbonyl compounds are presented. THE magnetic circular dichroism spectra of a number of aliphatic ketones have recently been shown to be sensitive to the structural environment around the carbonyl gr0up.l t With the exception of 1,1,l-trichloropropan-2-one.
Journal of the Forensic Science Society, 1977
The examination of colour is of particular importance in the investigatation of documents. Colour... more The examination of colour is of particular importance in the investigatation of documents. Coloured fillers may be used to decipher obliterated or altered writing and printing and apparently similar inks may be distinguished by photographic techniques or by thin layer chromatography of the constituent dyes. Sometimes the presence of even minute traces of colour can be significant.
Forensic Science International, 1983
... 82 CANON NPN11 1 6 1 i 10 iw XEROX 660 60 y I ~ 40 zaa / ~, TOSHIBAFAX BD711 ~I 60 40 1000 35... more ... 82 CANON NPN11 1 6 1 i 10 iw XEROX 660 60 y I ~ 40 zaa / ~, TOSHIBAFAX BD711 ~I 60 40 1000 3500 3000 25M 2000 me 1600 I6 B0 1200 1000 DOB 600 100 200 WAVENUMBER (CM ... This may be a result of poor sample, a faint copy or be a characteristic of the toner itself. ...
Forensic Science International, 1990
This paper discusses, with reference to specific case investigations, the various techniques avai... more This paper discusses, with reference to specific case investigations, the various techniques available for the solution of these problems. These include some very simple techniques which are in everyday use by forensic scientists, for example trained and informed visual and low power microscopic examination of the documents. They also include the application of techniques which are frequently used in forensic science laboratories, for example energy dispersive spectrometry (using a scanning electron microscope) and infra red spectroscopy, but which are rarely applied to document examination. Also involved are techniques which are well developed within particular fields — for example the detailed analysis of paper fibres — but which are rarely, if at all, used in forensic science.
Forensic Science International, 1985
Abstract Ink lines made by porous tip and roller ball pens have been examined by high performance... more Abstract Ink lines made by porous tip and roller ball pens have been examined by high performance thin layer chromatography (HPTLC) and by transmission microspectrophotometry (VM) in the visible region. Better discrimination between apparently similar coloured inks was obtained with HPTLC but VM has value as an additional technique for ink examination.
Forensic Science International, 1979
ABSTRACT
Journal of the Forensic Science Society, 1985
Information Technology & The Law, 1986
Chemischer Informationsdienst
Journal of the Forensic Science Society
An evaluation was made of the SIGNCHECK signature verifier. The equipment digitizes signatures on... more An evaluation was made of the SIGNCHECK signature verifier. The equipment digitizes signatures on cheques and compares them with a reference set of parameter values encoded on the cheque. Its performance in its intended role, as a screening device for unseen forgeries at the time of presentation of a cheque, was adequate, but it has numerous limitations as a laboratory aid to the investigation of questioned signatures. It is a step towards mechanization of this task, and some deficiencies may be remedied by improvements to the device, such as increasing the resolution of the scanning.
Journal of the Chemical Society D Chemical Communications, 1969
Journal of the Chemical Society D Chemical Communications, 1971
Can J Chem, 1971
In the presence of chiral environment compounds, C, optical rotation is induced in symmetric subs... more In the presence of chiral environment compounds, C, optical rotation is induced in symmetric substrates, S, and may be detected as circular dichroism in the electronic spectra of the solutions. Thus the n − π* transitions of symmetric and racemic carbonyl compounds, and of symmetric nitro and azo compounds, become optically active when these S are dissolved in chiral hydrocarbons, ketones, or carbinols, or in solutions of these C in achiral solvents. The rotational strengths of the induced circular dichroism bands of S are solvent, temperature, and concentration dependent. Only limited correlation of the sign and magnitude of the induced bands with the stereochemistry of C and S is evident on the data so far accumulated. Halogenated achiral solvents enhance the intensity, and, in some cases reverse the sign of the induced bands.A new mechanism of asymmetric induction is proposed in which specific bonding of C with S is not prerequisite.
Information Technology & The Law, 1990