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blow-post
blow-post n.
Brit. 
/ˈbləʊpəʊst/
, /ˈbləʊpəʊst/U.S. /ˈbloʊˌpoʊst/
a system of conveying letters and parcels by pneumatic tubes./ˈbloʊˌpoʊst/ΘΚΠ
society > communication > correspondence > postal services > [noun] > types of service > conveyance of mail by pneumatic tube
pneumatic dispatch1860
blow-post1881
1881 Daily News 8 Nov. 5/5 A writer..advocates the extension of the ‘blow-post.’
1885 Pall Mall Gaz. 5 Mar. 4/1 In Paris the blow post is being steadily developed.
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as lemmas