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monografia
POSSEDUTO
Ayrton, William Edward, 1847-1908
Portable voltmeters for measuring alternating potential differences / by W.E. Ayrton and John Perry
[S.l. : s.n., 189-?]
monografia
POSSEDUTO
Practical mathematics
summary of six lectures delivered to working men by John Perry at the Museum of Practical Geology, Jermyn Street, February and March, 1899 : with certain exercises supposed to be worked after every lecture Perry, John    Anno: 1899
Perry, John
Practical mathematics : summary of six lectures delivered to working men by John Perry at the Museum of Practical Geology, Jermyn Street, February and March, 1899 : with certain exercises supposed to be worked after every lecture
London : printed for Her Majesty's Stationery Office by Wyman, 1899.
spoglio
POSSEDUTO
Ayrton, William Edward, 1847-1908
Quadrant electrometers / by W.E. Ayrton, J. Perry and W.E. Sumpner
London : published for the Royal society by Kegan Paul, Trench, Trübner, 1892.
monografia
POSSEDUTO
The steam engine and gas and oil engines
a book for the use of students who have time to make experiments and calculations Perry, John    Anno: 1900
Perry, John
The steam engine and gas and oil engines : a book for the use of students who have time to make experiments and calculations / by John Perry
London : Macmillan, 1900.
spoglio
POSSEDUTO
Ayrton, William Edward, 1847-1908
Testing the power and efficiency of trasformers / by W.E. Ayrton and John Perry
[S.l. : s.n., 1888?]