Ingram in the ninth edition of the Encyclopaedia Britannica is still a valuable historical account.
Grubb's duplex micrometer is described in the 9th edition of the Encyclopaedia Britannica.
Tunstall's Ornithologia Britannica, which appeared in 1771, is little more than a list of names.'
It may be convenient here to state how the whole subject of chemistry is treated in this edition of the Encyclopaedia Britannica.
These instruments thus produced, in Haydn's and Beethoven's times, a very remarkable but closely limited series of effects, which, as Sir George Macfarren pointed out in the article "Music" in the 9th edition of the Encyclopaedia Britannica, gave them a peculiar character and function in strongly asserting the main notes of the key.
